Parkes RRL survey

The Parkes radio telescope undertook a large survey of HI, called the HI-Parkes-All-Sky-Survey (HIPASS), which focussed on detecting HI emission from galaxies. We have re-analysed this large data set, including data from the Zone of Avoidance (ZOA) survey, to extract 3 radio recombination lines (RRLs) that happen to lie in the passband of the receiver: these are the H166-168alpha lines.

Early results of this analysis are published in Alves et al. (2010) and Alves et al. (2012). The final Galactic plane survey, covering longitudes 248-0-52 degrees is now available for download below. The data reduction and analysis is described in Alves et al. (2015, MNRAS, 450, 2025). The image above shows the integrated RRL intensity map covering a large area of the Galactic plane.